What is 'endgame'?

In many places in the MK community, whether it be on Reddit, GeekHack, Deskthority, or here on MD, you hear this term 'endgame'.
I saw what seems to be to me a fitting meme- the scene from the matrix with the statement that has entered the consciousness'there is no spoon' being replaced with 'there is no endgame'. (I can't find the GIF right now, unfortunately)
For me, personally, I just like to experiment and create and collect- so I don't even know what an 'endgame' keyboard would look like that would squash that desire for the process, rather than a physical item.
So I guess my questions is- what is endgame to you? Or is it just something that you'll know when you see it? And why is it your endgame?

Tastes change, but atm my endgame is a Topre Realforce 87u with BKE heavy domes and KBDFans sliders in the Norbaforce housing with galaxy console powder coat with Amazing Chocolatier caps. I've gotten ahold of everything, just waiting on the Norbaforce. Endgame+ will be a matching Realforce 23u.

Glad you posted something regarding end game! I do have similar questions for all the MK lovers out there.
Agree with @LatrFlex and I do think end game will take some time to "complete" if it ever will :p
I tend to get pretty greedy myself :p
Layout - probably the most important - I love 60% but sometimes I crave those arrow keys - so a keyboard 64-71 keys layout would be it.
Switches - probably really important - really digging the BOX Thick Clicks right now. BOX Navy in particular.
Aesthetics + Quality - keycaps, case (material, weight, etc), artisans, cable, LEDs - Huge artisan fan here, don't know if I will ever have an end game for Artisans. Would definitely want a cohesive theme for these.
Never ending criteria for an end-game keyboard for me, perhaps it will change, perhaps it won't.

Once my daily driver keyset is complete, I'll probably back off of buying keys for a while.

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Currently the top row is going to be replaced completely with the Sweet Tooth set. I also need to find some red and blue keys for the bottom row (either custom prints from WASD or something equivalent).
I do intend to eventually pick up another GMMK-TKL and one of the full keysets as my work keyboard.

My keyboards are pretty much the way I like them.
I collect keycaps because I like how folks take the time to make something other wise invisibly utilitarian worth paying attention to.
So I don't think I'm going to see endgame on my collection so long as folks keep making sets I think are worth keeping.

I'm about to reach my current endgame which is the K-Type with Laser. Just gotta wait for that Laser delivery. After that, I dunno. I'm sure something else will catch my eye.
Edit: I forgot that I've been trying to get a birb cap from keymaker.space for ages, which would be my artisan endgame, and also that I need to find a cable that I like to match laser.

Endgame is finding a raiding guild for my lvl 15 Hunter. Also, all the communities you named are where you go to become stupid or kiss someone's ass.
End game for humanity is human centipede of likes and upvotes.

My personal endgame is an attractive tritium keycap (not just a single tube of tritium).
I have a wireless and a wired keyboard, a color-shifting spacebar, a custom wrist rest, the PBT doubleshot keycaps I want, and a separate numpad to go on the left side. What I want to finish it off is a nice keycap that glows in the dark. Maybe even a vantablack background for it. Maybe some tritium dots against vanta?

endgame is called being satisfied with what you got :^)
I mean, you can sell your old boards for new ones, but unless you have new place for each board,
you realize you can't use more than 1 board at once.
Unless well, you're like ergodox but with 2 fullsize or something :/

I'm just trying find/build my "perfect" keyboard. I'm thinking it's going to involve a custom case for my Ergodox, and a few other bits.
Once I figure it out, though, I wanna make a laptop with my keyboard built-in. Yeah, I know that's crazy and probably won't actually ever happen, but I really hate non-ergonomic keyboards, and dragging an external KB around with me is not only a royal pain, but it also really breaks the ergonomics of the trackpad, which means I'd need to haul around a mouse or somethin, too, and at some point the whole thing becomes so unwieldy that it defeats the purpose of having a laptop.

Some manufacturers have started building full travel mech boards into their laptops. There's not much choice for switches though, I recall seeing only MX red and brown as options, but have head that the speed switches are likely to go into newer models. You might be better off looking into this than going down a potentially costly and time consuming DIY route.
This monstrosity is the first example I came across: https://www.msi.com/Laptop/gt80-2qe-titan-sli.html#hero-overview

We all return to our roots eventually. Life is -- as said by the wizened old baboon in Lion King -- a circle. Birth, growth, maturity, and eventually decay, and finally death.
The circle of life has no exceptions. From dust we came, dust we become. Even the stars, the sun, the moon, astral beings we deem eternal, came from dust. They, too will falter and vanish into tule, and rise again, resplendent, radiant, transcendent.
I started with a membrane keyboard. I, too, will return to my roots.
This, is my beginning-game. This will be my endgame.

Endgame is something too hard to determined imho too, and from my pov it will be faraway since I am sucker for the collective part of it mostly with keysets especially in the form of SA or any tall profile like Matt3o's own MT3 profile where they could totally transform any normal looking keyboard into something totally radical looking.

for keycaps, I have a much longer end game. I still have a hard time finding a Dvorak key set for the boards I have that have a decent homing key. What signature plastic offers is not working for me, I seam to need those little dots or the raised bar, the deep dish just is not cutting it. So I don't expect to find my "end game" keycap till I can solve this issue.
For hardware I think an end game keyboard would be a split keyboard with the number pad in the middle. Never seen it yet, may have to make it if I ever find time.